Buggy code:
public class DecodeLayout implements ListSelectionListener , GeneralLayout { private Container pane ; private LayoutControl control ; private JList < String > list ; private DefaultListModel < String > list_model ; private JScrollPane scroll_pane ; private ArrayList < String > list_item ; private String list_selected ; private int pos_list_selected ; private JButton btn_image ; private JButton btn_file ; public DecodeLayout ( LayoutControl control , Container pane , ArrayList < String > items ) { } @ Override public void addComponentsToPane ( ) { } public Container getPane ( ) { } public void setPane ( Container pane ) { } public LayoutControl getControl ( ) { } public void setControl ( LayoutControl control ) { } public JList < String > getList ( ) { } public void setList ( JList < String > list ) { } public DefaultListModel < String > getList_model ( ) { } public void setList_model ( DefaultListModel < String > list_model ) { } public JScrollPane getScroll_pane ( ) { } public void setScroll_pane ( JScrollPane scroll_pane ) { } public ArrayList < String > getList_item ( ) { } public void setList_item ( ArrayList < String > list_item ) { } public String getList_selected ( ) { } public void setList_selected ( String list_selected ) { } public int getPos_list_selected ( ) { } public void setPos_list_selected ( int pos_list_selected ) { } public JButton getBtn_image ( ) { } public void setBtn_image ( JButton btn_image ) { } public JButton getBtn_file ( ) { } public void setBtn_file ( JButton btn_file ) { } public void updateList ( ) { } @ Override public void valueChanged ( ListSelectionEvent e ) { } private class DecodeAction implements ActionListener { @ Override public void actionPerformed ( ActionEvent e ) { if ( ( getList_selected ( ) ) != null ) { control . setRead_layout_current_file ( getList_selected ( ) ) ; control . setLayout ( "READ" ) ; } else { JOptionPane . showMessageDialog ( getPane ( ) , "devi<seq2seq4repair_space>selezionare<seq2seq4repair_space>un<seq2seq4repair_space>file" ) ; } } } private class AddAction implements ActionListener { @ Override public void actionPerformed ( ActionEvent e ) { <START_BUG> JFileChooser file_chooser = new JFileChooser ( control . getUser_manager ( ) . getActualUser ( ) . getDir_in ( ) ) ; <END_BUG> int choose = file_chooser . showDialog ( null , "apri" ) ; if ( choose == ( JFileChooser . APPROVE_OPTION ) ) { File file = file_chooser . getSelectedFile ( ) ; if ( control . isToDecode ( file ) ) { control . addDecodeChoice ( file . getAbsolutePath ( ) ) ; } else { JOptionPane . showMessageDialog ( getPane ( ) , "Deve<seq2seq4repair_space>essere<seq2seq4repair_space>un<seq2seq4repair_space>file<seq2seq4repair_space>PDF<seq2seq4repair_space>o<seq2seq4repair_space>un'immagine" ) ; } } } } private class RemoveAction implements ActionListener { @ Override public void actionPerformed ( ActionEvent arg0 ) { control . removeItem ( getPos_list_selected ( ) ) ; updateList ( ) ; System . out . println ( ( "rimosso<seq2seq4repair_space>elemento<seq2seq4repair_space>in<seq2seq4repair_space>posizione<seq2seq4repair_space>" + ( getPos_list_selected ( ) ) ) ) ; } } }

Fix:
JFileChooser file_chooser = new JFileChooser ( control . getUser_manager ( ) . getActualUser ( ) . getDir_out ( ) ) ;